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Circadian clocks regulate the rhythms of biological activities with a period of approximately 24-hours and synchronize plant metabolism and physiology with the environmental cycles. The clock also gates responses to environmental stresses to maximize fitness advantages. Here we report that the MYB96 transcription factor is connected with the clock oscillator to shape the circadian gating of abscisic acid (ABA) responses. MYB96 directly binds to the  TIMING OF CAB EXPRESSION 1  ( TOC1 ) promoter to positively regulate its expression. The use of  myb96  mutant plants shows that this regulation is essential for the gated induction of  TOC1  by ABA. In turn,  MYB96  induction by ABA is also altered in  toc1-3  mutant plants. The increased tolerance to drought of  MYB96  over-expressing plants is decreased in the  toc1-3  mutant background, suggesting that MYB96 and TOC1 intersect the circadian clock and ABA signaling. The MYB96-TOC1 function might be also regulated by the clock component CIRCADIAN CLOCK-ASSOCIATED 1 (CCA1), which binds to the  MYB96  promoter and alters its circadian expression. Thus, a complex circuitry of CCA1-MYB96-TOC1 regulatory interactions provides the mechanistic basis underlying the connection between circadian and stress signaling to optimize plant fitness to ambient stresses.

MYB96 shapes the circadian gating of ABA signaling in Arabidopsis